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From "Pavel Yaskevich (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-3762) AutoSaving KeyCache and System load time improvements.
Date Tue, 24 Jan 2012 23:44:40 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-3762?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13192668#comment-13192668
] 

Pavel Yaskevich commented on CASSANDRA-3762:
--------------------------------------------

bq. No it is basically a average of multiple runs....  Without any additional writes... start
and immediatly stop and compare the logs... both tests are the same. Again it is on my laptop.

Which means the more you run the more data you get cached which affects the results, I would
suggest you to drop cache every time you run each of the tests to get cleaner load time values
when any I/O is involved.
                
> AutoSaving KeyCache and System load time improvements.
> ------------------------------------------------------
>
>                 Key: CASSANDRA-3762
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-3762
>             Project: Cassandra
>          Issue Type: Improvement
>          Components: Core
>    Affects Versions: 1.2
>            Reporter: Vijay
>            Assignee: Vijay
>            Priority: Minor
>             Fix For: 1.2
>
>         Attachments: 0001-SavedKeyCache-load-time-improvements.patch
>
>
> CASSANDRA-2392 saves the index summary to the disk... but when we have saved cache we
will still scan through the index to get the data out.
> We might be able to separate this from SSTR.load and let it load the index summary, once
all the SST's are loaded we might be able to check the bloomfilter and do a random IO on fewer
Index's to populate the KeyCache.

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